TAK Technology
MF1
NI-MG-ZN MATERIALS
MF1 is a Ni-Mg-Zn ferrite with an initial permeability (μi) of approx. 180, a saturation flux density (Bs) of approx. 350 mT at 25 °C (185 mT at 100 °C) and a Curie temperature above 210 °C. The low permeability raises its usable frequency ceiling, and with the Curie point above 210 °C it stays stable in the MHz-range RF/IF bands, while Bs of 350 mT retains a fair flux capability. Typical uses are RF/IF filters, resonant inductors and HF signal-line EMI suppression — the step that covers high-frequency small-signal duties at the lowest material cost. Note that MF numbering does not follow permeability: MF1 is the low-μi high-frequency branch, MF2 (μi approx. 800) is the high-permeability low-frequency branch, and MF3 (approx. 350) sits between with the lowest loss — select by μi and band, not by the numeral.
Magnetic Characteristics
| Characteristic | Condition | Value | Unit |
|---|---|---|---|
| μiInitial Permeability | 100 kHz & <0.2 mT | 180±25% | — |
| BsSaturation Flux Density | 3000 A/m · 25 ℃100 Hz | 350 | mT |
| BsSaturation Flux Density | 3000 A/m · 100 ℃100 Hz | 185 | mT |
| BrRemanence | 3000 A/m · 25 ℃100 Hz | 240 | mT |
| BrRemanence | 3000 A/m · 100 ℃100 Hz | 85 | mT |
| HcCoercivity | 3000 A/m · 25 ℃100 Hz | 25 | A/m |
| HcCoercivity | 3000 A/m · 100 ℃100 Hz | 15 | A/m |
| αμrTemperature coefficient of permeability | 20～60 ℃ | 35 | ×10⁻⁶/K |
| tanδ/μiRelative Loss Factor | 0.1 MHz & <0.2 mT | 55 | ×10⁻⁶ |
| tanδ/μiRelative Loss Factor | 0.5 MHz & <0.2 mT | 70 | ×10⁻⁶ |
| TcCurie Temp. | 100 kHz & <0.2 mT | >210 | ℃ |
| DDensity | Archimedes method | 4.9 | g/cm³ |
| ρVolume Resistivity | DC Current | 10⁷ | Ω·m |
Characteristic curves
Applications
| Application | Role | Band | Temperature |
|---|---|---|---|
| Cost-effective inductor / EMI (Mg-based: Ni-Mg-Zn / Mg-Zn) | First choice | 0.1–1.4 MHz | — |